<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>catch方法</title>
</head>

<body>
    <script>
        const p = new Promise((resolve, reject) => {
            reject("出错啦!");
        });

        p.then(value => { }, reason => {
            console.error(reason);
        });

        // catch 只能用来处理失败的回调
        p.catch(reason => {
            console.warn(reason);
        });
    </script>
</body>

</html>